Preliminary support for zstd compression (#210)

Author: megastep

.github/workflows/build.yml

@@ -12,11 +12,11 @@ jobs:
     steps:
     - name: Install Linux packages
       if: runner.os == 'Linux'
-      run: sudo env DEBIAN_FRONTEND=noninteractive apt-get -qq -y install pbzip2
+      run: sudo env DEBIAN_FRONTEND=noninteractive apt-get -qq -y install pbzip2 zstd
 
     - name: Install macOS packages
       if: runner.os == 'macOS'
-      run: brew install pbzip2 coreutils
+      run: brew install pbzip2 coreutils zstd
 
     - name: Checkout Makeself
       uses: actions/checkout@v2

makeself.sh

@@ -105,13 +105,14 @@ MS_Usage()
     echo "    --quiet | -q       : Do not print any messages other than errors."
     echo "    --gzip             : Compress using gzip (default if detected)"
     echo "    --pigz             : Compress with pigz"
+    echo "    --zstd             : Compress with zstd"
     echo "    --bzip2            : Compress using bzip2 instead of gzip"
     echo "    --pbzip2           : Compress using pbzip2 instead of gzip"
     echo "    --xz               : Compress using xz instead of gzip"
     echo "    --lzo              : Compress using lzop instead of gzip"
     echo "    --lz4              : Compress using lz4 instead of gzip"
     echo "    --compress         : Compress using the UNIX 'compress' command"
-    echo "    --complevel lvl    : Compression level for gzip pigz xz lzo lz4 bzip2 and pbzip2 (default 9)"
+    echo "    --complevel lvl    : Compression level for gzip pigz zstd xz lzo lz4 bzip2 and pbzip2 (default 9)"
     echo "    --threads thds     : Number of threads to be used by compressors that support parallelization."
     echo "                         Omit to use compressor's default. Most useful (and required) for opting"
     echo "                         into xz's threading, usually with '--threads=0' for all available cores."
@@ -233,6 +234,10 @@ do
     	COMPRESS=pigz
     	shift
     	;;
+    --zstd)
+    	COMPRESS=zstd
+    	shift
+    	;;
     --xz)
 	COMPRESS=xz
 	shift
@@ -500,6 +505,10 @@ pigz)
     fi
     GUNZIP_CMD="gzip -cd"
     ;;
+zstd)
+    GZIP_CMD="zstd -$COMPRESS_LEVEL"
+    GUNZIP_CMD="zstd -cd"
+    ;;
 pbzip2)
     GZIP_CMD="pbzip2 -c$COMPRESS_LEVEL"
     if test $THREADS -ne $DEFAULT_THREADS; then # Leave as the default if threads not indicated

test/extracttest

@@ -46,6 +46,15 @@ testPBzip2()
   assertEqual $? 0
 }
 
+testZstd()
+{
+  # Skip if zstd is not available
+  which zstd || return
+  setupTests --zstd
+
+  ./makeself-test.run --check
+  assertEqual $? 0
+}
 
 source bashunit/bashunit.bash